Improved extension door-knobs



UNITED STATES PATENT OFFICE.

W. T. MUNGER, OF BRANFORD, ASSIGNOR TO HIMSELF AND JAS. GRAHAM,

OF NEW HAVEN, CONNECTICUT.

IMPROVED EXTENSION DOOR-KNOBS.

Specification forming part of Letters Patent No. 48,874, dated July 18, 1865.

To all lwhom it may concern.-

Beit known that I, W. T. MUNGER, of Branford, in the county of New Haven and State of Connecticut, have invented a new and Improved Mode of Securing Door-Knobs to their bpindles; and I do hereby declare the following, when taken in connection with the accompanying drawings and the letters of reference marked thereon, to be a full, clear, and exact description ot' the same, and which said drawings constitute part ot' this specification, and

' the distance between the two knobs may be adjusted to the thickness of the door without the use otwashers between the knobs and rose or screw to secure the knob to the spindle, as in common use.

lo enable others skilled in the art to construct and use my in1provement,Iwill proceed to fully describe the same, asillnstrated in the accompanying drawings.

A is the spindle, secured to one ot` the knobs, B, in the usual manner. U is the adjustable knob, D, the rose.

On the end of the spindle to which the adjustable knob is to be attached I cut an ordinary screw-thread, cutting only the corners, pressing the square form to tit the hole in the shank, as seen in Fig. 1. The rose D, I construct as seen in Fig. 2, with a nut attached to it to screw onto the spindle.

The socket d is formed to receive the knob C. The shank F ofthe said knob C, as seen in Fig. 4, is formed so as to enter and till the socket l of the rose D. A lip or projection, e, is formed in the socket d, as seen in Figs. 2 and8. A groove, f, is formed around the shank F, and a notchnl, opening into the said groove, as seen in Figs. 4 and 5. The shank of the Y knob C inserted into the socket d, so that the projection e will pass through the notch i, then turned partially around,the lip e will pass into the groove f and secure the knob to t-he rose. When the spindle A (the knob B secured to it in the usual manner) is passed through the door and latch, the lrose D is turned onto the spindle until it arrives at its place against the door. The knob C is then placed on over the spindle in the usual manner, the shank entering the socket ot' the rose, and the lip turned int-o the groove, as before described, the rose then secured to the door by screws or otherwise in theusual manner. The knob cannot be removed from the spindle, the latch preventing its being turned sufficiently to be released from the lip e, and thus the two knobs are secured together and adjusted to the thickness ofthe door withoutthe use ot' wasllersor screw t through knob and spindle.

Instead ot' cutting the thread upon the spindle,as described, parallel grooves n may be cut around the spindle, as seen in Fig. 6; and instead of the nut in the rose, as described, a plate, m, corresponding in thickness to the width of the grooves inthe shank, attached to or made a part of the rose, as seen in Fig. 7. The hole through the plate m, elongated and made seinicircular, as seen in Fig. 7, permits the spindle A to be inserted, as seen in Fig. 7, then the rose set into the groove, as seen in Fig. 8, which will secure the rose to the spindie, the knob to be attached as before described.

I prefer the first method described, as the adjustment may be unlimited, while by thelastdescribed itis qualified by the distance between the grooves on the spindle.

Having therefore thus fully described my invention, what I claim as new and useful, and wish to secure by Letters Patent, is

The combination of the groovcd shank F with a lip, e, or its equivalent, in the socket of the rose, in the manner and for the purpose described.

W. T. MUNGER. Witnesses:

J oHN E. EARLE, MARY A. HINE. 

